how to disable third party repositories ubuntu 12.04

Solution 1:

You can disable third party repository by following any of two ways:

1. Execute this command in terminal

   sudo software-properties-gtk
   

   In Software Sources window go to Other Softwares .tab and delete or uncheck the repositories listed there. First delete/uncheck the repositories except first four. If it doesn't solve your issue then Uncheck the first four also. Close and run sudo apt-get update

2. You can also disable by following these steps:

   Ubuntu Software Center > Edit > Software Sources > Other Software tab > clear/uncheck the check-boxes. Follow the same rule as given in 1st method.

3rd part repository provides additional packages/software which are generally not available in default Ubuntu repository. So disabling it would not cause any issue.

Reply if something goes wrong..